Add some external dependencies.

extern/EtcLib/EtcCodec/EtcBlock4x4Encoding_RGB8A1.h

@@ -0,0 +1,129 @@
+/*
+ * Copyright 2015 The Etc2Comp Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "EtcBlock4x4Encoding_RGB8.h"
+#include "EtcErrorMetric.h"
+#include "EtcBlock4x4EncodingBits.h"
+
+namespace Etc
+{
+
+	// ################################################################################
+	// Block4x4Encoding_RGB8A1
+	// RGB8A1 if not completely opaque or transparent
+	// ################################################################################
+
+	class Block4x4Encoding_RGB8A1 : public Block4x4Encoding_RGB8
+	{
+	public:
+
+		static const unsigned int TRANSPARENT_SELECTOR = 2;
+
+		Block4x4Encoding_RGB8A1(void);
+		virtual ~Block4x4Encoding_RGB8A1(void);
+
+		virtual void InitFromSource(Block4x4 *a_pblockParent,
+									ColorFloatRGBA *a_pafrgbaSource,
+									unsigned char *a_paucEncodingBits,
+									ErrorMetric a_errormetric);
+
+		virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
+											unsigned char *a_paucEncodingBits,
+											ColorFloatRGBA *a_pafrgbaSource,
+											ErrorMetric a_errormetric);
+
+		virtual void PerformIteration(float a_fEffort);
+
+		virtual void SetEncodingBits(void);
+
+		void InitFromEncodingBits_ETC1(Block4x4 *a_pblockParent,
+										unsigned char *a_paucEncodingBits,
+										ColorFloatRGBA *a_pafrgbaSource,
+										ErrorMetric a_errormetric);
+
+		void InitFromEncodingBits_T(void);
+		void InitFromEncodingBits_H(void);
+
+		void PerformFirstIteration(void);
+
+		void Decode_ETC1(void);
+		void DecodePixels_T(void);
+		void DecodePixels_H(void);
+		void SetEncodingBits_ETC1(void);
+		void SetEncodingBits_T(void);
+		void SetEncodingBits_H(void);
+
+	protected:
+
+		bool m_boolOpaque;				// all source pixels have alpha >= 0.5
+		bool m_boolTransparent;			// all source pixels have alpha < 0.5
+		bool m_boolPunchThroughPixels;	// some source pixels have alpha < 0.5
+
+		static float s_aafCwOpaqueUnsetTable[CW_RANGES][SELECTORS];
+
+	private:
+
+		void TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
+								int a_iGrayOffset1, int a_iGrayOffset2);
+		void TryDifferentialHalf(DifferentialTrys::Half *a_phalf);
+
+		void TryT(unsigned int a_uiRadius);
+		void TryT_BestSelectorCombination(void);
+		void TryH(unsigned int a_uiRadius);
+		void TryH_BestSelectorCombination(void);
+
+		void TryDegenerates1(void);
+		void TryDegenerates2(void);
+		void TryDegenerates3(void);
+		void TryDegenerates4(void);
+
+	};
+
+	// ################################################################################
+	// Block4x4Encoding_RGB8A1_Opaque
+	// RGB8A1 if all pixels have alpha==1
+	// ################################################################################
+
+	class Block4x4Encoding_RGB8A1_Opaque : public Block4x4Encoding_RGB8A1
+	{
+	public:
+
+		virtual void PerformIteration(float a_fEffort);
+
+		void PerformFirstIteration(void);
+
+	private:
+
+	};
+
+	// ################################################################################
+	// Block4x4Encoding_RGB8A1_Transparent
+	// RGB8A1 if all pixels have alpha==0
+	// ################################################################################
+
+	class Block4x4Encoding_RGB8A1_Transparent : public Block4x4Encoding_RGB8A1
+	{
+	public:
+
+		virtual void PerformIteration(float a_fEffort);
+
+	private:
+
+	};
+
+} // namespace Etc